Middle English, from Anglo-French desmaier, from des- dis- + -maier, from Vulgar Latin *-magare, of Germanic origin; akin to Old High German magan to be able — more at may entry 1
dismay
verb
Synonyms & Antonyms (Entry 1 of 2)
1 to lessen the courage or confidence of //the imposing climb up the mountain dismayed us even before we got started